Buildcraft

4.2.2

• New: Iron Fluid Pipes now get orientation triggers as well. (Speiger)
  
• Fix: Engines no longer drop double the items. (CovertJaguar)
  
• Fix: Filler Pattern selection is less derpy. (CovertJaguar)
  
• Fix: Desert Oil Biome should decorate. (CovertJaguar)
  
• Fix: Advanced Crafting Table now properly supports custom IRecipes with variable outputs. (CovertJaguar)
  

4.2.1

• Fix: Gold and Void Item Pipes work properly again. (SandGrainOne)

4.2.0

• New: Added Emzuli Pipe, a Gate controlled Extraction Pipe. (SandGrainOne/CovertJaguar)
  
• Change: Fillers no longer have a "crafting" grid, and can be controlled via Gates. (CovertJaguar)
  
• Change: Oil Springs produce 4x as much Oil as before. (CovertJaguar)
  
• Change: Pumps can be disabled by applying a Redstone signal. (CovertJaguar)
  
• Change: Allow draining of Fuel from Combustion Engines. (CovertJaguar)
  
• Change: Renamed Lapis Pipe to Lazuli Pipe. (CovertJaguar)
  
• Fix: Register all remaining Items properly with FML so that they will survive a 1.6->1.7 world upgrade. (CovertJaguar)
  
• Fix: Players can now see pipes placed by other players. (CovertJaguar)
  
• Fix: Block Harvesting now calls the appropriate new Forge Events. (DemoXin)
  
• Fix: Fixed Oil and Fuel Fluid localizations. (CovertJaguar)
  
• Fix: Diazuli Pipe should now better handle overflow situations similar to how the Diamond Pipe works. (CovertJaguar)
  
• API: Added API package and dependency information for new FML features. Should reduce API conflicts going forward. (cpw)
  
• API: Rewrote Filler Pattern API. (CovertJaguar)
  
• API: Added a new function to the Assembly Table recipe API that supports the Ore Dictionary. (taelnia/CovertJaguar)
  
• API: Moved ILaserTarget to the API so that addons can now create blocks that accept power from Lasers. (CovertJaguar)
  

Caveats

Requires Forge for MC 1.6.4 (9.11.1.953+)

You must install this version first if you plan to upgrade your world to MC 1.7 eventually.